一台PC建立到某台服务器的2个telnet连接时,服务器使用( )哪个选项确定这些会话彼此之间是不同的。
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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